Planet Nine

I have a fondness for all things astronomy, so this CNN article piqued my interest:

We may be a step closer to figuring out the origins of Planet Nine, a mysterious world lurking at the edge of our solar system. 

For months, headlines have been buzzing about the possibility that our solar system is harboring a rogue planet that has a mass 10 times that of Earth, and scientists have recently noticed it. 

If our solar system really does have another planet, it didn't just come out of nowhere, scientists said. 

Astronomers believe if such a world does exist, it was pulled into our solar system by the sun, according to a new report in the journal Monthly Notices of the Royal Astronomical Society. 

Scientists believe Planet Nine is really an exoplanet, a world that orbits a star outside a solar system.

Here is a useful infographic on Planet Nine, from Bibliotecapleyades.net:

Is Planet Nine possible? When you consider that smaller Kuiper Belt objects are kept in orbit around the sun, it isn't far-fetched that a larger planet could also be in orbit that far away.